#ifndef QJSSCANNER_H
#define QJSSCANNER_H


#include <QStringList>

#include "js_editor_global.h"

class JSEDITOR_EXPORT Token
{
public:
    enum Kind {
        EndOfFile,
        Keyword,
        Identifier,
        String,
        Comment,
        Number,
        LeftParenthesis,
        RightParenthesis,
        LeftBrace,
        RightBrace,
        LeftBracket,
        RightBracket,
        Semicolon,
        Colon,
        Comma,
        Dot,
        Delimiter,
        RegExp
    };

    inline Token(): offset(0), length(0), kind(EndOfFile) {}
    inline Token(int o, int l, Kind k): offset(o), length(l), kind(k) {}
    inline int begin() const { return offset; }
    inline int end() const { return offset + length; }
    inline bool is(int k) const { return k == kind; }
    inline bool isNot(int k) const { return k != kind; }

    bool    operator ==(const Token &token)
    {
        return (token.offset==offset
                && token.length==length
                && token.kind==kind);
    }

    bool    operator ==(const Token &token)const
    {
        return (token.offset==offset
                && token.length==length
                && token.kind==kind);
    }

    bool operator !=(const Token &token)
    {
        return !(*this==token);
    }

    bool operator !=(const Token &token)const
    {
        return !(*this==token);
    }

public:
    int offset;
    int length;
    Kind kind;
};

class JSEDITOR_EXPORT Scanner
{
public:
    enum {
        Normal = 0,
        MultiLineComment = 1,
        MultiLineStringDQuote = 2,
        MultiLineStringSQuote = 3,
        MultiLineMask = 3,

        RegexpMayFollow = 4 // flag that may be combined with the above
    };

    Scanner();
    virtual ~Scanner();

    bool scanComments() const;
    void setScanComments(bool scanComments);

    QList<Token> operator()(const QString &text, int startState = Normal);
    int state() const;

    bool isKeyword(const QString &text) const;
    static QStringList keywords();

private:
    int _state;
    bool _scanComments: 1;
};


#endif // QJSSCANNER_H
